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Finding the Fourth Proportional to 395,611.20, 593,416.80 and 129,380.40

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Solution

The fourth proportional to 395,611.20, 593,416.80 and 129,380.40 is: 194,070.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    395,611.20 : 593,416.80 = 129,380.40 : x
  2. Step 2: Convert to fraction form
    395,611.20/593,416.80 = 129,380.40/x
  3. Step 3: Cross multiply
    395,611.20x = 593,416.80 × 129,380.40
  4. Step 4: Simplify right side
    395,611.20x = 76,776,502,950.72
  5. Step 5: Solve for x
    x = 76,776,502,950.72/395,611.20
  6. Step 6: Final answer
    x = 194,070.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.